The times used in the graph below are the minimum times each code took for 100 trials to run with varying array sizes. (Size is the edge length of the Julia set.)

As you can see, using NumPy alone can speed up the Julia set calculation by a little over an order of magnitude; applying Numba to NumPy had no effect (as expected). Numba gave speeds 10x faster than the NumPy, illustrating the advantage Numba brings.